International maritime law is the framework that makes it possible for an owner in one country, a charterer in another, and a cargo bound for a third to trust the same set of rules will govern their dispute if something goes wrong. Unlike most areas of commercial law, shipping has built a genuinely international body of convention and custom precisely because the alternative — every voyage governed by whichever national law it happens to touch — would make cross-border trade unworkable. This chapter gives the framework; the practical contract and cargo-claim mechanics that sit inside it are covered in the next chapter on maritime commercial law.

Nothing in this chapter is legal advice — it is a working orientation for a commercial desk, and any specific dispute should go to qualified maritime lawyers.

UNCLOS: The Constitution of the Oceans

The United Nations Convention on the Law of the Sea (UNCLOS) sets the basic geography of maritime law: territorial waters, exclusive economic zones, the high seas, and the right of innocent passage through another state’s waters. It is the reason a vessel can transit most of the world’s coastlines without individual permission, and the backdrop against which every more specific shipping convention operates.

IMO Conventions: Safety, Pollution and Cargo

The International Maritime Organization administers the conventions that most directly affect a dry bulk fixture’s day-to-day operation, including SOLAS (Safety of Life at Sea, covering vessel construction and safety equipment), MARPOL (pollution prevention, covering everything from oil discharge to ballast water and now greenhouse gas intensity), and the IMSBC Code governing solid bulk cargo safety specifically. These conventions bind vessels through their flag state’s ratification and are enforced in practice through class surveys and Port State Control.

Carriage of Goods: Hague, Hague-Visby and Hamburg Rules

The rules governing a carrier’s liability for cargo loss or damage sit in a separate convention family — the Hague Rules, the amended Hague-Visby Rules, and the less widely adopted Hamburg Rules — incorporated into a Bill of Lading through a paramount clause. Which convention applies is not automatic; it depends on the trade, the jurisdiction named in the contract, and what the paramount clause actually says, which is exactly why that clause deserves closer reading than it usually gets.

Limitation of Liability Conventions

Shipowners have historically been entitled to limit their total liability for a casualty to a figure calculated from the vessel’s tonnage, under conventions such as the 1976 LLMC (Convention on Limitation of Liability for Maritime Claims) and its later protocol. This is a deliberate policy choice — spreading catastrophic risk in a way that keeps shipping insurable — and it is one of the reasons marine insurance, covered in a later chapter, is structured the way it is.

General Average: An Ancient Rule Still in Daily Use

General Average — the principle that a sacrifice or expense deliberately incurred to save a voyage from a common peril is shared proportionally among all the interests saved, not borne solely by whoever made the sacrifice — predates almost every modern convention and is still routinely invoked today, most often after groundings, fires or major machinery casualties. It is administered in practice through the York-Antwerp Rules, a privately drafted set of rules that charter parties and bills of lading typically incorporate by reference.

Jurisdiction and Dispute Resolution

Because a single voyage can touch several countries’ legal systems, most charter parties nominate a specific governing law and dispute forum up front — commonly English law with London arbitration for dry bulk, reflecting London’s historic position as the centre of shipping law, insurance and finance. This is a genuine commercial advantage of fixing on English law terms: a large body of settled case law exists on almost every standard clause, which reduces genuine legal uncertainty compared with a less-tested jurisdiction, even where the vessel, owner and charterer have no other connection to England at all.

Why the Framework Matters to a Broker Day to Day

A broker does not need to litigate a case to benefit from understanding this framework — knowing which convention likely governs a cargo claim, why English law and London arbitration are the market default, and how liability limitation actually works changes how a dispute risk is read and priced into a fixture from the outset, rather than discovered only once something has already gone wrong.

Sources of International Maritime Law

International maritime law is built from several distinct layers rather than a single code. At the top sits the UN Convention on the Law of the Sea (UNCLOS), which sets out the basic jurisdictional map of the oceans: territorial waters, exclusive economic zones and the high seas. Beneath that sit the IMO conventions (SOLAS, MARPOL, STCW, the Load Line Convention and others) that govern the safety, pollution and crewing standards of the ships themselves. A third layer consists of private law conventions such as the Hague-Visby Rules, which govern the commercial relationship between a carrier and a cargo owner rather than the ship’s safety.

A working chartering manager rarely needs to read these conventions directly, but understanding which layer a problem sits in changes how it gets resolved. A pollution incident triggers MARPOL and coastal state jurisdiction; a cargo damage dispute triggers the Hague-Visby Rules and the terms of the bill of lading; a crewing dispute triggers STCW and flag state or port state authority. Misidentifying which regime applies is a common and costly mistake in a fast-moving casualty or claim.

Flag State, Port State and Coastal State Jurisdiction

Jurisdiction over a merchant ship is shared between three different states, and each plays a different enforcement role. The flag state, whose flag the vessel flies, has primary responsibility for certifying that the ship and her crew comply with international conventions. The port state, where the vessel calls, has the right to inspect a foreign-flagged vessel and detain her if she is found substandard, a power exercised through regional Port State Control regimes such as the Paris MOU. The coastal state, in whose territorial waters or exclusive economic zone a vessel is transiting, has more limited powers, generally confined to safety of navigation and pollution prevention.

This three-way jurisdictional split is what allows a genuinely global shipping industry to function without every ship being subject to the full domestic law of every country she passes through, while still giving port states real teeth to stop unsafe tonnage from operating in their waters.

Dispute Resolution in International Shipping

Because charterparties and bills of lading routinely involve parties from different countries, the industry has settled on a small number of preferred dispute resolution mechanisms rather than relying on national courts, which would create unpredictable outcomes depending on where a claim happened to be filed. English law and London arbitration remain the dominant choice for dry bulk and tanker charterparties, largely because of the depth of shipping case law built up over more than a century and the specialist arbitrator pool available through bodies such as the London Maritime Arbitrators Association.

New York and Singapore arbitration are the next most common alternatives, each with their own body of precedent and their own specialist bar. A charterparty’s law and arbitration clause is therefore never a formality: it determines which legal tradition will interpret every other clause in the contract if a dispute ever arises, and experienced brokers pay close attention to it during negotiation for exactly that reason.